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    <ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inbuildn.html">Inbuild Modules</a></li><li><a href="index.html">supervisor</a></li><li><a href="index.html#7">Chapter 7: Extension Indexing</a></li><li><b>Index Pages</b></li></ul></div>
<p class="purpose">To generate the two top-level pages in the extension mini-website.</p>

<ul class="toc"><li><a href="7-ip.html#SP1">&#167;1. Writing the extensions home page</a></li><li><a href="7-ip.html#SP3">&#167;3. The key</a></li><li><a href="7-ip.html#SP4">&#167;4. Icons for virtual machines</a></li><li><a href="7-ip.html#SP5">&#167;5. Displaying VM restrictions</a></li><li><a href="7-ip.html#SP7">&#167;7. Sorting criteria</a></li></ul><hr class="tocbar">

<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Writing the extensions home page. </b>There were once two of these, but now there's just one.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::write</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::write</span></span>:<br/>The Mini-Website - <a href="7-tm.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inform_project</span><span class="plain-syntax"> *</span><span class="identifier-syntax">proj</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">proj</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no project"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="7-tm.html#SP3" class="function-link"><span class="function-syntax">ExtensionWebsite::cut_way_for_index_page</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">proj</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">F</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>

<span class="plain-syntax">    </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">L</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">U</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">inbuild_copy</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">inbuild_requirement</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">internals_used</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">materials_used</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">externals_used</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">internals_installed</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">materials_installed</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">See what we have installed and used</span><span class="named-paragraph-number">1.1</span></a></span><span class="plain-syntax">;</span>

<span class="plain-syntax">    </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> </span><span class="identifier-syntax">HOMEPAGE_struct</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = &amp;</span><span class="identifier-syntax">HOMEPAGE_struct</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">STREAM_OPEN_TO_FILE</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">UTF8_ENC</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">InformPages::header</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Extensions"</span><span class="plain-syntax">, </span><span class="identifier-syntax">JAVASCRIPT_FOR_ONE_EXTENSION_IRES</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2" class="named-paragraph-link"><span class="named-paragraph">Write the body of the HTML</span><span class="named-paragraph-number">1.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">InformPages::footer</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">STREAM_CLOSE</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP1_1" class="paragraph-anchor"></a><b>&#167;1.1.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">See what we have installed and used</span><span class="named-paragraph-number">1.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">search_list</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax"> *</span><span class="identifier-syntax">materials</span><span class="plain-syntax"> = </span><a href="5-ps2.html#SP6" class="function-link"><span class="function-syntax">Projects::materials_nest</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">proj</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">materials</span><span class="plain-syntax">) </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">materials</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax">, </span><span class="identifier-syntax">search_list</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax"> *</span><span class="identifier-syntax">internal</span><span class="plain-syntax"> = </span><a href="1-ic.html#SP16" class="function-link"><span class="function-syntax">Supervisor::internal</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">internal</span><span class="plain-syntax">) </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">internal</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_nest</span><span class="plain-syntax">, </span><span class="identifier-syntax">search_list</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_requirement</span><span class="plain-syntax"> *</span><span class="identifier-syntax">req</span><span class="plain-syntax"> = </span><a href="2-rqr.html#SP2" class="function-link"><span class="function-syntax">Requirements::anything_of_genre</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">extension_bundle_genre</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">search_list</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><a href="2-nst.html#SP9" class="function-link"><span class="function-syntax">Nests::search_for</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">req</span><span class="plain-syntax">, </span><span class="identifier-syntax">search_list</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><a href="7-ip.html#SP6" class="function-link"><span class="function-syntax">ExtensionIndex::find_used_extensions</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">proj</span><span class="plain-syntax">, </span><span class="identifier-syntax">U</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">INTERNAL_NEST_TAG</span><span class="plain-syntax">) </span><span class="identifier-syntax">internals_installed</span><span class="plain-syntax">++;</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">MATERIALS_NEST_TAG</span><span class="plain-syntax">) </span><span class="identifier-syntax">materials_installed</span><span class="plain-syntax">++;</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_copy</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_copy</span><span class="plain-syntax">, </span><span class="identifier-syntax">U</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest_of_origin</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest_of_origin</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">                </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">INTERNAL_NEST_TAG:</span><span class="plain-syntax"> </span><span class="identifier-syntax">internals_used</span><span class="plain-syntax">++; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">                </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">MATERIALS_NEST_TAG:</span><span class="plain-syntax"> </span><span class="identifier-syntax">materials_used</span><span class="plain-syntax">++; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">default:</span><span class="plain-syntax"> </span><span class="identifier-syntax">externals_used</span><span class="plain-syntax">++; </span><a href="2-nst.html#SP8" class="function-link"><span class="function-syntax">Nests::add_search_result</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">L</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest_of_origin</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">req</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">            }</span>
<span class="plain-syntax">        }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1">&#167;1</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2" class="paragraph-anchor"></a><b>&#167;1.2.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Write the body of the HTML</span><span class="named-paragraph-number">1.2</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_html_table</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::first_html_column</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">,</span>
<span class="plain-syntax">        </span><span class="string-syntax">"src='inform:/doc_images/extensions@2x.png' border=0 width=150 height=150"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::next_html_column</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>

<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"div"</span><span class="plain-syntax">, </span><span class="string-syntax">"class=\"headingpanellayout headingpanelalt\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"div"</span><span class="plain-syntax">, </span><span class="string-syntax">"class=\"headingtext\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"headingpaneltextalt"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Extensions in this Project"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"div"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"div"</span><span class="plain-syntax">, </span><span class="string-syntax">"class=\"headingrubric\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"headingpanelrubricalt"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Those installed and those used"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"div"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"div"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_1" class="named-paragraph-link"><span class="named-paragraph">Display the location of installed extensions</span><span class="named-paragraph-number">1.2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_html_row</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_html_table</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_TAG</span><span class="plain-syntax">(</span><span class="string-syntax">"hr"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"b"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"The project '%S' currently uses..."</span><span class="plain-syntax">, </span><span class="identifier-syntax">proj</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">title</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"b"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">usage_state</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2" class="named-paragraph-link"><span class="named-paragraph">Display an alphabetised directory</span><span class="named-paragraph-number">1.2.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_TAG</span><span class="plain-syntax">(</span><span class="string-syntax">"hr"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">internals_used</span><span class="plain-syntax"> &lt; </span><span class="identifier-syntax">internals_installed</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">materials_used</span><span class="plain-syntax"> &lt; </span><span class="identifier-syntax">materials_installed</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"b"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"These are available, but are not used by '%S'..."</span><span class="plain-syntax">, </span><span class="identifier-syntax">proj</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">title</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"b"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">usage_state</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2" class="named-paragraph-link"><span class="named-paragraph">Display an alphabetised directory</span><span class="named-paragraph-number">1.2.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1">&#167;1</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_1" class="paragraph-anchor"></a><b>&#167;1.2.1.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Display the location of installed extensions</span><span class="named-paragraph-number">1.2.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="2-nst.html#SP5" class="function-link"><span class="function-syntax">Nests::get_location</span></a><span class="plain-syntax">(</span><a href="5-ps2.html#SP6" class="function-link"><span class="function-syntax">Projects::materials_nest</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">proj</span><span class="plain-syntax">));</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Pathnames::down</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Extensions"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">PasteButtons::open_file</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="constant-syntax">PROJECT_SPECIFIC_SYMBOL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&amp;nbsp;"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">materials_installed</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%d extension%s installed in the .materials folder for the "</span>
<span class="plain-syntax">            </span><span class="string-syntax">"project '%S'"</span><span class="plain-syntax">,</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">materials_installed</span><span class="plain-syntax">, (</span><span class="identifier-syntax">materials_installed</span><span class="plain-syntax">==1)?</span><span class="string-syntax">" is"</span><span class="plain-syntax">:</span><span class="string-syntax">"s are"</span><span class="plain-syntax">,</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">proj</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">title</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="identifier-syntax">materials_installed</span><span class="plain-syntax">, </span><span class="identifier-syntax">u</span><span class="plain-syntax"> = </span><span class="identifier-syntax">materials_used</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_1_1" class="named-paragraph-link"><span class="named-paragraph">Say how many of those installed are used</span><span class="named-paragraph-number">1.2.1.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" (Click the icon to show the location.)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"No extensions are installed in the .materials folder for the "</span>
<span class="plain-syntax">            </span><span class="string-syntax">"project '%S'. (Click the icon to show the location. "</span>
<span class="plain-syntax">            </span><span class="string-syntax">"Extensions should be put in the 'Extensions' subfolder of this: you "</span>
<span class="plain-syntax">            </span><span class="string-syntax">"can put them there yourself, or use the Inform app to install them "</span>
<span class="plain-syntax">            </span><span class="string-syntax">"for you.)"</span><span class="plain-syntax">, </span><span class="identifier-syntax">proj</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">title</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>

<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="constant-syntax">BUILT_IN_SYMBOL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&amp;nbsp;"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"The Inform app comes with a small number of built-in extensions, which "</span>
<span class="plain-syntax">        </span><span class="string-syntax">"you need not install, and which are automatically included if necessary. "</span>
<span class="plain-syntax">        </span><span class="string-syntax">"'%S' has access to %d"</span><span class="plain-syntax">, </span><span class="identifier-syntax">proj</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">title</span><span class="plain-syntax">, </span><span class="identifier-syntax">internals_installed</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="identifier-syntax">internals_installed</span><span class="plain-syntax">, </span><span class="identifier-syntax">u</span><span class="plain-syntax"> = </span><span class="identifier-syntax">internals_used</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_1_1" class="named-paragraph-link"><span class="named-paragraph">Say how many of those installed are used</span><span class="named-paragraph-number">1.2.1.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>

<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">externals_used</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="constant-syntax">LEGACY_AREA_SYMBOL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&amp;nbsp;"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"And '%S' still uses %d extension%s from the legacy extensions area. Best "</span>
<span class="plain-syntax">            </span><span class="string-syntax">"practice is to install %s into .materials instead, which the Inform app "</span>
<span class="plain-syntax">            </span><span class="string-syntax">"can do for you."</span><span class="plain-syntax">,</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">proj</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">title</span><span class="plain-syntax">, </span><span class="identifier-syntax">externals_used</span><span class="plain-syntax">, (</span><span class="identifier-syntax">externals_used</span><span class="plain-syntax">==1)?</span><span class="string-syntax">""</span><span class="plain-syntax">:</span><span class="string-syntax">"s"</span><span class="plain-syntax">, (</span><span class="identifier-syntax">externals_used</span><span class="plain-syntax">==1)?</span><span class="string-syntax">"it"</span><span class="plain-syntax">:</span><span class="string-syntax">"them"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2">&#167;1.2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_1_1" class="paragraph-anchor"></a><b>&#167;1.2.1.1.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Say how many of those installed are used</span><span class="named-paragraph-number">1.2.1.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">u</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">", but it doesn't use it."</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> == </span><span class="constant-syntax">2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">", but it doesn't use either of them."</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">", but it doesn't use any of them."</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">u</span><span class="plain-syntax"> &lt; </span><span class="identifier-syntax">i</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">", but it uses only %d."</span><span class="plain-syntax">, </span><span class="identifier-syntax">u</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">u</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">", and it uses it."</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">u</span><span class="plain-syntax"> == </span><span class="constant-syntax">2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">", and it uses both of them."</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">", and it uses all of them."</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_1">&#167;1.2.1</a> (twice).</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2" class="paragraph-anchor"></a><b>&#167;1.2.2.  </b>The following is an alphabetised directory of extensions by author and then
title, along with some useful information about them, and then a list of
any oddities found in the external extensions area.
</p>

<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Display an alphabetised directory</span><span class="named-paragraph-number">1.2.2</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">key_list</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">no_entries</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">L</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> **</span><span class="identifier-syntax">sorted_census_results</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Memory::calloc</span><span class="plain-syntax">(</span><span class="identifier-syntax">no_entries</span><span class="plain-syntax">,</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *), </span><span class="constant-syntax">RESULTS_SORTING_MREASON</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax"> = </span><span class="constant-syntax">3</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">no_entries_in_set</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_3" class="named-paragraph-link"><span class="named-paragraph">Sort the census into the appropriate order</span><span class="named-paragraph-number">1.2.2.3</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4" class="named-paragraph-link"><span class="named-paragraph">Display the sorted version of the census</span><span class="named-paragraph-number">1.2.2.4</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_1" class="named-paragraph-link"><span class="named-paragraph">Print the key to any symbols used in the census lines</span><span class="named-paragraph-number">1.2.2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_2" class="named-paragraph-link"><span class="named-paragraph">Transcribe any census errors</span><span class="named-paragraph-number">1.2.2.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">Memory::I7_array_free</span><span class="plain-syntax">(</span><span class="identifier-syntax">sorted_census_results</span><span class="plain-syntax">, </span><span class="constant-syntax">RESULTS_SORTING_MREASON</span><span class="plain-syntax">,</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">no_entries</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *));</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2">&#167;1.2</a> (twice).</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_1" class="paragraph-anchor"></a><b>&#167;1.2.2.1.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Print the key to any symbols used in the census lines</span><span class="named-paragraph-number">1.2.2.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::render_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">key_list</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2">&#167;1.2.2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_2" class="paragraph-anchor"></a><b>&#167;1.2.2.2.  </b>Census errors are nothing more than copy errors arising on the copies
of extensions found by the census:
</p>

<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Transcribe any census errors</span><span class="named-paragraph-number">1.2.2.2</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">no_census_errors</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax">&lt;</span><span class="identifier-syntax">no_entries_in_set</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res</span><span class="plain-syntax"> = </span><span class="identifier-syntax">sorted_census_results</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">];</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">no_census_errors</span><span class="plain-syntax"> +=</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">errors_reading_source_text</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">no_census_errors</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_2_1" class="named-paragraph-link"><span class="named-paragraph">Include the headnote explaining what census errors are</span><span class="named-paragraph-number">1.2.2.2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax">&lt;</span><span class="identifier-syntax">no_entries_in_set</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res</span><span class="plain-syntax"> = </span><span class="identifier-syntax">sorted_census_results</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">];</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">errors_reading_source_text</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">                </span><span class="reserved-syntax">copy_error</span><span class="plain-syntax"> *</span><span class="identifier-syntax">CE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">CE</span><span class="plain-syntax">, </span><span class="reserved-syntax">copy_error</span><span class="plain-syntax">,</span>
<span class="plain-syntax">                    </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">errors_reading_source_text</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">                    #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">INDEX_MODULE</span>
<span class="plain-syntax">                    </span><span class="identifier-syntax">HTML::open_indented_p</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">2</span><span class="plain-syntax">, </span><span class="string-syntax">"hanging"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                    #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">                    #</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">INDEX_MODULE</span>
<span class="plain-syntax">                    </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                    #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">                    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&lt;b&gt;%X&lt;/b&gt; - "</span><span class="plain-syntax">, </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                    </span><a href="2-ce.html#SP5" class="function-link"><span class="function-syntax">CopyErrors::write</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">CE</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                }</span>
<span class="plain-syntax">            }</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">    }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2">&#167;1.2.2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_2_1" class="paragraph-anchor"></a><b>&#167;1.2.2.2.1.  </b>We only want to warn people here: not to stop them from using Inform
until they put matters right.
</p>

<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Include the headnote explaining what census errors are</span><span class="named-paragraph-number">1.2.2.2.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_TAG</span><span class="plain-syntax">(</span><span class="string-syntax">"hr"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"border=0 align=\"left\" src=inform:/doc_images/census_problem.png"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&lt;b&gt;Warning&lt;/b&gt;. Inform checks the folder of user-installed extensions "</span>
<span class="plain-syntax">        </span><span class="string-syntax">"each time it translates the source text, in order to keep this directory "</span>
<span class="plain-syntax">        </span><span class="string-syntax">"page up to date. Each file must be a properly labelled extension (with "</span>
<span class="plain-syntax">        </span><span class="string-syntax">"its titling line correctly identifying itself), and must be in the right "</span>
<span class="plain-syntax">        </span><span class="string-syntax">"place - e.g. 'Marbles by Daphne Quilt' must have the filename 'Marbles.i7x' "</span>
<span class="plain-syntax">        </span><span class="string-syntax">"(or just 'Marbles' with no file extension) and be stored in the folder "</span>
<span class="plain-syntax">        </span><span class="string-syntax">"'Daphne Quilt'. The title should be at most %d characters long; the "</span>
<span class="plain-syntax">        </span><span class="string-syntax">"author name, %d. At the last check, these rules were not being followed:"</span><span class="plain-syntax">,</span>
<span class="plain-syntax">            </span><span class="constant-syntax">MAX_EXTENSION_TITLE_LENGTH</span><span class="plain-syntax">, </span><span class="constant-syntax">MAX_EXTENSION_AUTHOR_LENGTH</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_2">&#167;1.2.2.2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_3" class="paragraph-anchor"></a><b>&#167;1.2.2.3.  </b></p>

<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">SORT_CE_BY_TITLE</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">SORT_CE_BY_AUTHOR</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">SORT_CE_BY_LOCATION</span><span class="plain-syntax"> </span><span class="constant-syntax">3</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">SORT_CE_BY_USAGE</span><span class="plain-syntax"> </span><span class="constant-syntax">4</span>
</pre>
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Sort the census into the appropriate order</span><span class="named-paragraph-number">1.2.2.3</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">inbuild_copy</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_copy</span><span class="plain-syntax">, </span><span class="identifier-syntax">U</span><span class="plain-syntax">)</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">C</span><span class="plain-syntax"> == </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">                </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">            }</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">found</span><span class="plain-syntax"> == </span><span class="identifier-syntax">usage_state</span><span class="plain-syntax">) </span><span class="identifier-syntax">sorted_census_results</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">++] = </span><span class="identifier-syntax">res</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">no_entries_in_set</span><span class="plain-syntax"> = </span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">criterion</span><span class="plain-syntax">)(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">d</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">SORT_CE_BY_TITLE:</span><span class="plain-syntax"> </span><span class="identifier-syntax">criterion</span><span class="plain-syntax"> = </span><a href="7-ip.html#SP7" class="function-link"><span class="function-syntax">ExtensionIndex::compare_res_by_title</span></a><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">SORT_CE_BY_AUTHOR:</span><span class="plain-syntax"> </span><span class="identifier-syntax">criterion</span><span class="plain-syntax"> = </span><a href="7-ip.html#SP7" class="function-link"><span class="function-syntax">ExtensionIndex::compare_res_by_author</span></a><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">SORT_CE_BY_LOCATION:</span><span class="plain-syntax"> </span><span class="identifier-syntax">criterion</span><span class="plain-syntax"> = </span><a href="7-ip.html#SP7" class="function-link"><span class="function-syntax">ExtensionIndex::compare_res_by_location</span></a><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">SORT_CE_BY_USAGE:</span><span class="plain-syntax"> </span><span class="identifier-syntax">criterion</span><span class="plain-syntax"> = </span><a href="7-ip.html#SP7" class="function-link"><span class="function-syntax">ExtensionIndex::compare_res_by_title</span></a><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">default:</span><span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no such sorting criterion"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">qsort</span><span class="plain-syntax">(</span><span class="identifier-syntax">sorted_census_results</span><span class="plain-syntax">, (</span><span class="identifier-syntax">size_t</span><span class="plain-syntax">) </span><span class="identifier-syntax">no_entries_in_set</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *),</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">criterion</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2">&#167;1.2.2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4" class="paragraph-anchor"></a><b>&#167;1.2.2.4.  </b>Standard rows have black text on striped background colours, these being
the usual ones seen in Mac OS X applications such as iTunes.
</p>

<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Display the sorted version of the census</span><span class="named-paragraph-number">1.2.2.4</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_html_table</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"stripeone"</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="constant-syntax">2</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_1" class="named-paragraph-link"><span class="named-paragraph">Show a titling row explaining the census sorting, if necessary</span><span class="named-paragraph-number">1.2.2.4.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">stripe</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">current_author_name</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax">&lt;</span><span class="identifier-syntax">no_entries_in_set</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res</span><span class="plain-syntax"> = </span><span class="identifier-syntax">sorted_census_results</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">];</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_2" class="named-paragraph-link"><span class="named-paragraph">Insert a subtitling row in the census sorting, if necessary</span><span class="named-paragraph-number">1.2.2.4.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">stripe</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax"> - </span><span class="identifier-syntax">stripe</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">stripe</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">HTML::first_html_column_coloured</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"stripetwo"</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">else</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">HTML::first_html_column_coloured</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"stripeone"</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_4" class="named-paragraph-link"><span class="named-paragraph">Print the census line for this extension</span><span class="named-paragraph-number">1.2.2.4.4</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML::end_html_row</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">stripe</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
<span class="plain-syntax">            </span><a href="7-ip.html#SP2" class="function-link"><span class="function-syntax">ExtensionIndex::first_html_column_wrapping</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"stripetwo"</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">, </span><span class="constant-syntax">48</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">else</span>
<span class="plain-syntax">            </span><a href="7-ip.html#SP2" class="function-link"><span class="function-syntax">ExtensionIndex::first_html_column_wrapping</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"stripeone"</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">, </span><span class="constant-syntax">48</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_5" class="named-paragraph-link"><span class="named-paragraph">Print the rubric line for this extension</span><span class="named-paragraph-number">1.2.2.4.5</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML::end_html_row</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">current_author_name</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_3" class="named-paragraph-link"><span class="named-paragraph">Show a final titling row closing the census sorting</span><span class="named-paragraph-number">1.2.2.4.3</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_html_table</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2">&#167;1.2.2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_1" class="paragraph-anchor"></a><b>&#167;1.2.2.4.1.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Show a titling row explaining the census sorting, if necessary</span><span class="named-paragraph-number">1.2.2.4.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">d</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">SORT_CE_BY_TITLE:</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">SORT_CE_BY_USAGE:</span>
<span class="plain-syntax">            </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_1_1" class="named-paragraph-link"><span class="named-paragraph">Begin a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Extensions in alphabetical order"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">            </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_1_2" class="named-paragraph-link"><span class="named-paragraph">End a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">SORT_CE_BY_LOCATION:</span>
<span class="plain-syntax">            </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_1_1" class="named-paragraph-link"><span class="named-paragraph">Begin a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Extensions grouped by location"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">            </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_1_2" class="named-paragraph-link"><span class="named-paragraph">End a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4">&#167;1.2.2.4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_2" class="paragraph-anchor"></a><b>&#167;1.2.2.4.2.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Insert a subtitling row in the census sorting, if necessary</span><span class="named-paragraph-number">1.2.2.4.2</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">d</span><span class="plain-syntax"> == </span><span class="constant-syntax">SORT_CE_BY_AUTHOR</span><span class="plain-syntax">) &amp;&amp;</span>
<span class="plain-syntax">        (</span><span class="identifier-syntax">Str::ne</span><span class="plain-syntax">(</span><span class="identifier-syntax">current_author_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">author_name</span><span class="plain-syntax">))) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">Str::copy</span><span class="plain-syntax">(</span><span class="identifier-syntax">current_author_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">author_name</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_1_1" class="named-paragraph-link"><span class="named-paragraph">Begin a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_2_1" class="named-paragraph-link"><span class="named-paragraph">Print the author's line in the extension census table</span><span class="named-paragraph-number">1.2.2.4.2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_1_2" class="named-paragraph-link"><span class="named-paragraph">End a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">stripe</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4">&#167;1.2.2.4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_3" class="paragraph-anchor"></a><b>&#167;1.2.2.4.3.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Show a final titling row closing the census sorting</span><span class="named-paragraph-number">1.2.2.4.3</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_1_1" class="named-paragraph-link"><span class="named-paragraph">Begin a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"smaller"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%d extensions in total"</span><span class="plain-syntax">, </span><span class="identifier-syntax">no_entries_in_set</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_1_2" class="named-paragraph-link"><span class="named-paragraph">End a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.2</span></a></span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4">&#167;1.2.2.4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_1_1" class="paragraph-anchor"></a><b>&#167;1.2.2.4.1.1.  </b>Usually white text on a grey background.
</p>

<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Begin a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::first_html_column_coloured</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"tintedrow"</span><span class="plain-syntax">, </span><span class="constant-syntax">4</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"extensioncensusentry"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&amp;nbsp;"</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4_1">&#167;1.2.2.4.1</a> (twice), <a href="7-ip.html#SP1_2_2_4_2">&#167;1.2.2.4.2</a>, <a href="7-ip.html#SP1_2_2_4_3">&#167;1.2.2.4.3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_1_2" class="paragraph-anchor"></a><b>&#167;1.2.2.4.1.2.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">End a tinted census line</span><span class="named-paragraph-number">1.2.2.4.1.2</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_html_row</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4_1">&#167;1.2.2.4.1</a> (twice), <a href="7-ip.html#SP1_2_2_4_2">&#167;1.2.2.4.2</a>, <a href="7-ip.html#SP1_2_2_4_3">&#167;1.2.2.4.3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_2_1" class="paragraph-anchor"></a><b>&#167;1.2.2.4.2.1.  </b>Used only in "by author".
</p>

<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Print the author's line in the extension census table</span><span class="named-paragraph-number">1.2.2.4.2.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">raw_author_name</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4_2">&#167;1.2.2.4.2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_4" class="paragraph-anchor"></a><b>&#167;1.2.2.4.4.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Print the census line for this extension</span><span class="named-paragraph-number">1.2.2.4.4</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_4_1" class="named-paragraph-link"><span class="named-paragraph">Print column 1 of the census line</span><span class="named-paragraph-number">1.2.2.4.4.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::next_html_column_nw</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_4_2" class="named-paragraph-link"><span class="named-paragraph">Print column 2 of the census line</span><span class="named-paragraph-number">1.2.2.4.4.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::next_html_column_nw</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_4_3" class="named-paragraph-link"><span class="named-paragraph">Print column 3 of the census line</span><span class="named-paragraph-number">1.2.2.4.4.3</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::next_html_column_w</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_4_4" class="named-paragraph-link"><span class="named-paragraph">Print column 4 of the census line</span><span class="named-paragraph-number">1.2.2.4.4.4</span></a></span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4">&#167;1.2.2.4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_4_1" class="paragraph-anchor"></a><b>&#167;1.2.2.4.4.1.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Print column 1 of the census line</span><span class="named-paragraph-number">1.2.2.4.4.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"extensionindexentry"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">d</span><span class="plain-syntax"> != </span><span class="constant-syntax">SORT_CE_BY_AUTHOR</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">raw_title</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">) != </span><span class="constant-syntax">INTERNAL_NEST_TAG</span><span class="plain-syntax">)</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" by %S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">raw_author_name</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">raw_title</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>

<span class="plain-syntax">    </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><a href="7-tm.html#SP5" class="function-link"><span class="function-syntax">ExtensionWebsite::page_filename</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">proj</span><span class="plain-syntax">, </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">, -1);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">TextFiles::exists</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">link</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">URL</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">URL</span><span class="plain-syntax">, </span><span class="string-syntax">"%f"</span><span class="plain-syntax">, </span><a href="7-tm.html#SP5" class="function-link"><span class="function-syntax">ExtensionWebsite::page_filename_relative_to_materials</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">, -1));</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">link</span><span class="plain-syntax">, </span><span class="string-syntax">"href='inform:/"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><a href="2-wrk.html#SP12" class="function-link"><span class="function-syntax">Works::escape_apostrophes</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">link</span><span class="plain-syntax">, </span><span class="identifier-syntax">URL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">link</span><span class="plain-syntax">, </span><span class="string-syntax">"' style=\"text-decoration: none\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"a"</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">link</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">link</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"%s"</span><span class="plain-syntax">, </span><span class="constant-syntax">HELP_SYMBOL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">HELP_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Documentation (click to read)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"a"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>

<span class="plain-syntax">    </span><span class="reserved-syntax">inform_extension</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="5-es.html#SP4" class="function-link"><span class="function-syntax">Extensions::from_copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">at</span><span class="plain-syntax"> = </span><a href="5-es.html#SP17" class="function-link"><span class="function-syntax">Extensions::get_inclusion_sentence</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">at</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">at</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">source_location</span><span class="plain-syntax"> </span><span class="identifier-syntax">sl</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Lexer::word_location</span><span class="plain-syntax">(</span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">));</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">sl</span><span class="plain-syntax">.</span><span class="identifier-syntax">file_of_origin</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">SourceLinks::link</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">sl</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
<span class="plain-syntax">            </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">REVEAL_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Included here (click to see)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">    }</span>

<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">errors_reading_source_text</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"%s"</span><span class="plain-syntax">, </span><span class="constant-syntax">PROBLEM_SYMBOL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">PROBLEM_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Has errors (see below)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">usage_state</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">inclusion_text</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">inclusion_text</span><span class="plain-syntax">, </span><span class="string-syntax">"Include %X.\n\n\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">PasteButtons::paste_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">inclusion_text</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">inclusion_text</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">PASTE_SYMBOL</span><span class="plain-syntax">,</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">I</span><span class="string-syntax">"Source text to Include this (click to paste in)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>

<span class="plain-syntax">    </span><span class="identifier-syntax">compatibility_specification</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">compatibility</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">parsed_from</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="named-paragraph-container code-font"><a href="7-ip.html#SP1_2_2_4_4_1_1" class="named-paragraph-link"><span class="named-paragraph">Append icons which signify the VM requirements of the extension</span><span class="named-paragraph-number">1.2.2.4.4.1.1</span></a></span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4_4">&#167;1.2.2.4.4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_4_1_1" class="paragraph-anchor"></a><b>&#167;1.2.2.4.4.1.1.  </b>VM requirements are parsed by feeding them into the lexer and calling the
same routines as would be used when parsing headings about VM requirements
in a normal run of Inform. Note that because the requirements are in round
brackets, which the lexer will split off as distinct words, we can ignore
the first and last word and just look at what is in between:
</p>

<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Append icons which signify the VM requirements of the extension</span><span class="named-paragraph-number">1.2.2.4.4.1.1</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><a href="7-ip.html#SP5" class="function-link"><span class="function-syntax">ExtensionIndex::write_icons</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4_4_1">&#167;1.2.2.4.4.1</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_4_2" class="paragraph-anchor"></a><b>&#167;1.2.2.4.4.2.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Print column 2 of the census line</span><span class="named-paragraph-number">1.2.2.4.4.2</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"smaller"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">VersionNumbers::is_null</span><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">version</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"v&amp;nbsp;%v"</span><span class="plain-syntax">, &amp;(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">version</span><span class="plain-syntax">));</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">else</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"--"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4_4">&#167;1.2.2.4.4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_4_3" class="paragraph-anchor"></a><b>&#167;1.2.2.4.4.3.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Print column 3 of the census line</span><span class="named-paragraph-number">1.2.2.4.4.3</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">opener</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">INTERNAL_NEST_TAG</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">opener</span><span class="plain-syntax"> = </span><span class="constant-syntax">BUILT_IN_SYMBOL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">BUILT_IN_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Built in"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">MATERIALS_NEST_TAG</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">opener</span><span class="plain-syntax"> = </span><span class="constant-syntax">PROJECT_SPECIFIC_SYMBOL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">PROJECT_SPECIFIC_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Installed in .materials"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">opener</span><span class="plain-syntax"> = </span><span class="constant-syntax">LEGACY_AREA_SYMBOL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">LEGACY_AREA_SYMBOL</span><span class="plain-syntax">,</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">I</span><span class="string-syntax">"Used from legacy extensions area"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">INTERNAL_NEST_TAG</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"%s"</span><span class="plain-syntax">, </span><span class="identifier-syntax">opener</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">        #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">INDEX_MODULE</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">area</span><span class="plain-syntax"> = </span><a href="4-em.html#SP3" class="function-link"><span class="function-syntax">ExtensionManager::path_within_nest</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">PasteButtons::open_file</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">area</span><span class="plain-syntax">,</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">raw_author_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">opener</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        #</span><span class="identifier-syntax">endif</span>
<span class="plain-syntax">    }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4_4">&#167;1.2.2.4.4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_4_4" class="paragraph-anchor"></a><b>&#167;1.2.2.4.4.4.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Print column 4 of the census line</span><span class="named-paragraph-number">1.2.2.4.4.4</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"smaller"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">d</span><span class="plain-syntax"> == </span><span class="constant-syntax">SORT_CE_BY_LOCATION</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">) == </span><span class="constant-syntax">INTERNAL_NEST_TAG</span><span class="plain-syntax">)</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Built in to Inform"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">else</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Installed in this project"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax"> = </span><a href="5-es.html#SP14" class="function-link"><span class="function-syntax">Extensions::get_rubric</span></a><span class="plain-syntax">(</span><a href="5-es.html#SP4" class="function-link"><span class="function-syntax">Extensions::from_copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">));</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">); </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"--"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4_4">&#167;1.2.2.4.4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2_2_4_5" class="paragraph-anchor"></a><b>&#167;1.2.2.4.5.  </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Print the rubric line for this extension</span><span class="named-paragraph-number">1.2.2.4.5</span></span><span class="comment-syntax"> =</span>
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::begin_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"smaller"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax"> = </span><a href="5-es.html#SP14" class="function-link"><span class="function-syntax">Extensions::get_rubric</span></a><span class="plain-syntax">(</span><a href="5-es.html#SP4" class="function-link"><span class="function-syntax">Extensions::from_copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">));</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">R</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">); </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"--"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML::end_span</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="7-ip.html#SP1_2_2_4">&#167;1.2.2.4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2.  </b>This is just too special-purpose to belong in the foundation module.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::first_html_column_wrapping</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::first_html_column_wrapping</span></span>:<br/><a href="7-ip.html#SP1_2_2_4">&#167;1.2.2.4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">width</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">classname</span><span class="plain-syntax">,</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">cs</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">left_padding</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">bottom_padding</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">classname</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"tr"</span><span class="plain-syntax">, </span><span class="string-syntax">"class=\"%S\""</span><span class="plain-syntax">, </span><span class="identifier-syntax">classname</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">else</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"tr"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">col</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">col</span><span class="plain-syntax">, </span><span class="string-syntax">"align=\"left\" valign=\"top\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">width</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">col</span><span class="plain-syntax">, </span><span class="string-syntax">" width=\"%d\""</span><span class="plain-syntax">, </span><span class="identifier-syntax">width</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">cs</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">col</span><span class="plain-syntax">, </span><span class="string-syntax">" colspan=\"%d\""</span><span class="plain-syntax">, </span><span class="identifier-syntax">cs</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">left_padding</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">bottom_padding</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">col</span><span class="plain-syntax">, </span><span class="string-syntax">" style=\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">left_padding</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">col</span><span class="plain-syntax">, </span><span class="string-syntax">"padding-left: %dpx;"</span><span class="plain-syntax">, </span><span class="identifier-syntax">left_padding</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">bottom_padding</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">col</span><span class="plain-syntax">, </span><span class="string-syntax">"padding-bottom: %dpx;"</span><span class="plain-syntax">, </span><span class="identifier-syntax">bottom_padding</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">col</span><span class="plain-syntax">, </span><span class="string-syntax">"\""</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"td"</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">col</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">col</span><span class="plain-syntax">)</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. The key. </b>There is just no need to do this efficiently in either running time or memory.
</p>

<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">PROBLEM_SYMBOL</span><span class="plain-syntax"> </span><span class="string-syntax">"border=\"0\" height=\"12\" src=\"inform:/doc_images/census_problem.png\""</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">REVEAL_SYMBOL</span><span class="plain-syntax"> </span><span class="string-syntax">"border=\"0\" src=\"inform:/doc_images/Reveal.png\""</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">HELP_SYMBOL</span><span class="plain-syntax"> </span><span class="string-syntax">"border=\"0\" src=\"inform:/doc_images/help.png\""</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">PASTE_SYMBOL</span><span class="plain-syntax"> </span><span class="string-syntax">"border=\"0\" src=\"inform:/doc_images/paste.png\""</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">BUILT_IN_SYMBOL</span><span class="plain-syntax"> </span><span class="string-syntax">"border=\"0\" src=\"inform:/doc_images/builtin_ext.png\""</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">PROJECT_SPECIFIC_SYMBOL</span><span class="plain-syntax"> </span><span class="string-syntax">"border=\"0\" src=\"inform:/doc_images/folder4.png\""</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">LEGACY_AREA_SYMBOL</span><span class="plain-syntax"> </span><span class="string-syntax">"border=\"0\" src=\"inform:/doc_images/pspec_ext.png\""</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">ARCH_16_SYMBOL</span><span class="plain-syntax"> </span><span class="string-syntax">"border=\"0\" src=\"inform:/doc_images/vm_z8.png\""</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">ARCH_32_SYMBOL</span><span class="plain-syntax"> </span><span class="string-syntax">"border=\"0\" src=\"inform:/doc_images/vm_glulx.png\""</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">image_URL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gloss</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">displayed</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax">;</span>

<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::add_to_key</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::add_to_key</span></span>:<br/><a href="7-ip.html#SP1_2_2_4_4_1">&#167;1.2.2.4.4.1</a>, <a href="7-ip.html#SP1_2_2_4_4_3">&#167;1.2.2.4.4.3</a>, <a href="7-ip.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">L</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">URL</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gloss</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">as_text</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">as_text</span><span class="plain-syntax">, </span><span class="string-syntax">"%s"</span><span class="plain-syntax">, </span><span class="identifier-syntax">URL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eki</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">eki</span><span class="plain-syntax">, </span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">image_URL</span><span class="plain-syntax">, </span><span class="identifier-syntax">as_text</span><span class="plain-syntax">))</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">found</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">eki</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">image_URL</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">as_text</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">gloss</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">gloss</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">displayed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">eki</span><span class="plain-syntax">, </span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">as_text</span><span class="plain-syntax">)</span>
<span class="plain-syntax">}</span>

<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::render_key</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::render_key</span></span>:<br/><a href="7-ip.html#SP1_2_2_1">&#167;1.2.2.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">L</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_OPEN</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Key: "</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sequence</span><span class="plain-syntax">[] = {</span>
<span class="plain-syntax">        </span><span class="constant-syntax">PROJECT_SPECIFIC_SYMBOL</span><span class="plain-syntax">, </span><span class="constant-syntax">BUILT_IN_SYMBOL</span><span class="plain-syntax">, </span><span class="constant-syntax">LEGACY_AREA_SYMBOL</span><span class="plain-syntax">,</span>
<span class="plain-syntax">        </span><span class="constant-syntax">HELP_SYMBOL</span><span class="plain-syntax">, </span><span class="constant-syntax">REVEAL_SYMBOL</span><span class="plain-syntax">, </span><span class="constant-syntax">PASTE_SYMBOL</span><span class="plain-syntax">, </span><span class="constant-syntax">PROBLEM_SYMBOL</span><span class="plain-syntax">,</span>
<span class="plain-syntax">        </span><span class="constant-syntax">ARCH_16_SYMBOL</span><span class="plain-syntax">, </span><span class="constant-syntax">ARCH_32_SYMBOL</span><span class="plain-syntax">,</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">NULL</span><span class="plain-syntax"> };</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">sequence</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] != </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">as_text</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">as_text</span><span class="plain-syntax">, </span><span class="string-syntax">"%s"</span><span class="plain-syntax">, </span><span class="identifier-syntax">sequence</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eki</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">eki</span><span class="plain-syntax">, </span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">image_URL</span><span class="plain-syntax">, </span><span class="identifier-syntax">as_text</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">image_URL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&amp;nbsp;%S &amp;nbsp;&amp;nbsp;"</span><span class="plain-syntax">, </span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">gloss</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">displayed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">            }</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">as_text</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eki</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">eki</span><span class="plain-syntax">, </span><span class="reserved-syntax">extensions_key_item</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">displayed</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">image_URL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&amp;nbsp;%S &amp;nbsp;&amp;nbsp;"</span><span class="plain-syntax">, </span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">gloss</span><span class="plain-syntax">);</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">eki</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">displayed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">HTML_CLOSE</span><span class="plain-syntax">(</span><span class="string-syntax">"p"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure extensions_key_item is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. Icons for virtual machines. </b>And everything else is cosmetic: printing, or showing icons to signify,
the current VM or some set of permitted VMs. The following plots the
icon associated with a given minor VM, and explicates what the icons mean:
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::plot_icon</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::plot_icon</span></span>:<br/><a href="7-ip.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">VM_image</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"border=0 src=inform:/doc_images/%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">VM_image</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"&amp;nbsp;"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. Displaying VM restrictions. </b>Given a word range, we describe the result as concisely as we can with a
row of icons (but do not bother for the common case where some extension
has no restriction on its use).
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::write_icons</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::write_icons</span></span>:<br/><a href="7-ip.html#SP1_2_2_4_4_1_1">&#167;1.2.2.4.4.1.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">,</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">compatibility_specification</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">something_16</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="identifier-syntax">everything_16</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><span class="identifier-syntax">something_32</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="identifier-syntax">everything_32</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">VM</span><span class="plain-syntax">, </span><span class="identifier-syntax">target_vm</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Architectures::is_16_bit</span><span class="plain-syntax">(</span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">architecture</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Compatibility::test</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">VM</span><span class="plain-syntax">))</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">something_16</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">else</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">everything_16</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Compatibility::test</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">VM</span><span class="plain-syntax">))</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">something_32</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">else</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">everything_32</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">everything_16</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">everything_32</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">everything_16</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">something_32</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"%s"</span><span class="plain-syntax">, </span><span class="constant-syntax">ARCH_16_SYMBOL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">ARCH_16_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Z-machine only (16-bit)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">everything_32</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">something_16</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">HTML_TAG_WITH</span><span class="plain-syntax">(</span><span class="string-syntax">"img"</span><span class="plain-syntax">, </span><span class="string-syntax">"%s"</span><span class="plain-syntax">, </span><span class="constant-syntax">ARCH_32_SYMBOL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">ARCH_32_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Glulx only (32-bit)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" - %S "</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">parsed_from</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">dictionary</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shown_already</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Dictionaries::new</span><span class="plain-syntax">(16, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">VM</span><span class="plain-syntax">, </span><span class="identifier-syntax">target_vm</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Compatibility::test</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">VM</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">icon</span><span class="plain-syntax"> = </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">VM_image</span><span class="plain-syntax">;</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">icon</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">                </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Dictionaries::find</span><span class="plain-syntax">(</span><span class="identifier-syntax">shown_already</span><span class="plain-syntax">, </span><span class="identifier-syntax">icon</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">                    </span><a href="7-ip.html#SP4" class="function-link"><span class="function-syntax">ExtensionIndex::plot_icon</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">VM</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                    </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">Dictionaries::create_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">shown_already</span><span class="plain-syntax">, </span><span class="identifier-syntax">icon</span><span class="plain-syntax">), </span><span class="string-syntax">"X"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                    </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">ARCH_16_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Z-machine only (16-bit)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                    </span><a href="7-ip.html#SP3" class="function-link"><span class="function-syntax">ExtensionIndex::add_to_key</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">key_list</span><span class="plain-syntax">, </span><span class="constant-syntax">ARCH_32_SYMBOL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Glulx only (32-bit)"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                }</span>
<span class="plain-syntax">            }</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6.  </b></p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::find_used_extensions</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::find_used_extensions</span></span>:<br/><a href="7-ip.html#SP1_1">&#167;1.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inform_project</span><span class="plain-syntax"> *</span><span class="identifier-syntax">proj</span><span class="plain-syntax">,</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">U</span><span class="plain-syntax">, </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">build_vertex</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax"> = </span><a href="2-cps.html#SP9" class="function-link"><span class="function-syntax">Copies::construct_project_graph</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">proj</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_copy</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><a href="7-ip.html#SP6" class="function-link"><span class="function-syntax">ExtensionIndex::find_used_extensions_r</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><a href="3-bg.html#SP8" class="function-link"><span class="function-syntax">Graphs::get_unique_graph_scan_count</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">U</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>

<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::find_used_extensions_r</span><span class="plain-syntax">(</span><span class="reserved-syntax">build_vertex</span><span class="plain-syntax"> *</span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">scan_count</span><span class="plain-syntax">,</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">U</span><span class="plain-syntax">, </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">V</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">type</span><span class="plain-syntax"> == </span><span class="constant-syntax">COPY_VERTEX</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">inbuild_copy</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><span class="identifier-syntax">V</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_copy</span><span class="plain-syntax">;</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">genre</span><span class="plain-syntax"> == </span><span class="identifier-syntax">extension_genre</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax">            (</span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">edition</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">genre</span><span class="plain-syntax"> == </span><span class="identifier-syntax">extension_bundle_genre</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">last_scanned</span><span class="plain-syntax"> != </span><span class="identifier-syntax">scan_count</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_copy</span><span class="plain-syntax">, </span><span class="identifier-syntax">U</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">C</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">last_scanned</span><span class="plain-syntax"> = </span><span class="identifier-syntax">scan_count</span><span class="plain-syntax">;</span>
<span class="plain-syntax">            }</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">V</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">type</span><span class="plain-syntax"> == </span><span class="constant-syntax">REQUIREMENT_VERTEX</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">V</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_requirement</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">genre</span><span class="plain-syntax"> == </span><span class="identifier-syntax">extension_genre</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax">            (</span><span class="identifier-syntax">V</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_requirement</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">work</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">genre</span><span class="plain-syntax"> == </span><span class="identifier-syntax">extension_bundle_genre</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">            </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">V</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">as_requirement</span><span class="plain-syntax">, </span><span class="reserved-syntax">inbuild_requirement</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">build_vertex</span><span class="plain-syntax"> *</span><span class="identifier-syntax">W</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="reserved-syntax">build_vertex</span><span class="plain-syntax">, </span><span class="identifier-syntax">V</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">build_edges</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP6" class="function-link"><span class="function-syntax">ExtensionIndex::find_used_extensions_r</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">scan_count</span><span class="plain-syntax">, </span><span class="identifier-syntax">U</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="reserved-syntax">build_vertex</span><span class="plain-syntax">, </span><span class="identifier-syntax">V</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">use_edges</span><span class="plain-syntax">)</span>
<span class="plain-syntax">        </span><a href="7-ip.html#SP6" class="function-link"><span class="function-syntax">ExtensionIndex::find_used_extensions_r</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">scan_count</span><span class="plain-syntax">, </span><span class="identifier-syntax">U</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. Sorting criteria. </b>The following give some sorting criteria, and are functions fit to be
handed to <span class="extract"><span class="extract-syntax">qsort</span></span>.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::compare_res_by_title</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::compare_res_by_title</span></span>:<br/><a href="7-ip.html#SP1_2_2_3">&#167;1.2.2.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">e1</span><span class="plain-syntax"> = *((</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">res1</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">e2</span><span class="plain-syntax"> = *((</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">res2</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inform_extension</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E1</span><span class="plain-syntax"> = </span><a href="5-es.html#SP4" class="function-link"><span class="function-syntax">Extensions::from_copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">e1</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inform_extension</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E2</span><span class="plain-syntax"> = </span><a href="5-es.html#SP4" class="function-link"><span class="function-syntax">Extensions::from_copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">e2</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="5-es.html#SP5" class="function-link"><span class="function-syntax">Extensions::compare_by_title</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">E2</span><span class="plain-syntax">, </span><span class="identifier-syntax">E1</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>

<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::compare_res_by_author</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::compare_res_by_author</span></span>:<br/><a href="7-ip.html#SP1_2_2_3">&#167;1.2.2.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">e1</span><span class="plain-syntax"> = *((</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">res1</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">e2</span><span class="plain-syntax"> = *((</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">res2</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inform_extension</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E1</span><span class="plain-syntax"> = </span><a href="5-es.html#SP4" class="function-link"><span class="function-syntax">Extensions::from_copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">e1</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inform_extension</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E2</span><span class="plain-syntax"> = </span><a href="5-es.html#SP4" class="function-link"><span class="function-syntax">Extensions::from_copy</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">e2</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">copy</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="5-es.html#SP5" class="function-link"><span class="function-syntax">Extensions::compare_by_author</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">E2</span><span class="plain-syntax">, </span><span class="identifier-syntax">E1</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>

<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ExtensionIndex::compare_res_by_location</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">ExtensionIndex::compare_res_by_location</span></span>:<br/><a href="7-ip.html#SP1_2_2_3">&#167;1.2.2.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">res2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">e1</span><span class="plain-syntax"> = *((</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">res1</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> *</span><span class="identifier-syntax">e2</span><span class="plain-syntax"> = *((</span><span class="reserved-syntax">inbuild_search_result</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">res2</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax"> = </span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">e1</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">) - </span><a href="2-nst.html#SP2" class="function-link"><span class="function-syntax">Nests::get_tag</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">e2</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">nest</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">d</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="7-ip.html#SP7" class="function-link"><span class="function-syntax">ExtensionIndex::compare_res_by_title</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">res1</span><span class="plain-syntax">, </span><span class="identifier-syntax">res2</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
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